MARTINEZ — A student at Martinez Junior High School scrawled the threat of a school shooting in one of the campus bathrooms and was arrested Tuesday, police said.

Investigators did not deem the threat credible and said no evidence turned up to indicate students at the school ever were in danger, police said. The student is suspected of writing on a bathroom mirror that he intended to “shoot up the school.”

The threat indicated the shooting would happen Wednesday.

According to police, the threat appears to have been made without any intent ever to carry it out, but California law states that any plausible threat of violence made against an individual is considered a crime.

Police staffed the school with extra patrol and took other precautions in the wake of the threat.

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